Proxy Auto Configuration (PAC) File Scripts 51
You can only use a PAC file to configure the Web browsers on client
machines when the Webcache is operating in Proxy mode.
You can use the Browser Auto-Configuration screen to create a PAC file
which is stored on the Webcache. You can configure the PAC file to:
■ Bypass the Webcache for plain host names
■ Use a backup Webcache if the first one fails
■ Directly access the Web if neither the first or second Webcache is
available
Alternatively, you can disable the PAC file that the Webcache creates and
use a different PAC file which is located elsewhere on your network.
CAUTION: If you are using Browser Auto-Configuration Files to configure
your client machine Web browser settings, and you are using Web Client
Blocking to control access to the Internet, you should ensure that Go
Direct if no Webcache Available is not ticked in the Browser
Auto-Configuration screen. If this box is ticked, the Web browser will
bypass the Webcache entirely after reading the Browser
Auto-Configuration file, and will never be blocked.
To use the Webcache as a PAC file server, first configure the Webcache
PAC file using the Browser Autoconfiguration screen:
1 Log in to the Web interface.
2 Click Device View on the Toolbar.
3 Select System -> Caching -> Browser Auto-Config in the Navigation
Tree.
4 Tick Bypass Plain Host Names if you want to configure Web browsers to
bypass the Webcache for plain host names. These are typically domain
names which do not contain dots, commonly used for Intranet sites e.g.
http://intranet
5 Tick Use Backup Cache on Cache Failure if you want to configure Web
browsers to use an alternative Webcache in your network if the first one
fails. Enter the IP address of the alternative Webcache in the Backup
Cache IP Address field. Enter the port number on which the Webcache
will be listening for network traffic in the Port field. The default port
number is 8080.
